.main-content-wrapper {
    transition: margin-left .3s ease-in-out;
}

/* ===== Sidebar Base Style ===== */
#topic-sidebar {
    background-color: var(--card-bg);
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1001;
    padding: 1.5rem;
    padding-top: 2rem;
    overflow-y: auto;
    transform: translateX(-100%);
    transition: transform .3s ease-in-out;
    border-right: 1px solid var(--border-color);
}

#topic-sidebar .sidebar-title {
    margin-top: 0;
    margin-bottom: 1rem;
    padding-bottom: .75rem;
    font-family: "Lora", serif;
    font-size: 1.4rem;
    color: var(--green);
    text-align: left;
    border-bottom: 2px solid var(--green);
}

#topic-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

#topic-nav li {
    margin-bottom: .25rem;
}

#topic-nav a {
    display: block;
    padding: .75rem 1rem;
    text-decoration: none;
    border-radius: 8px;
    color: var(--text-secondary);
    font-weight: 500;
    transition: background-color .2s ease, color .2s ease;
}

#topic-nav a.active,
#topic-nav a:hover {
    background-color: var(--accent-color);
    color: #fff;
}

/* Sidebar Toggle */
#topic-sidebar-toggle {
    display: block;
    position: fixed;
    top: 70px;
    left: 15px;
    z-index: 1;
    background-color: var(--accent-color);
    color: #fff;
    border: none;
    border-radius: 8px;
    width: auto;
    height: 40px;
    padding: 0 1rem;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, .2);
}

/* Overlay */
#sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, .5);
    z-index: 1000;
}
#sidebar-overlay.is-open {
    display: block;
}
.app-footer {
   
    z-index: 2; }

/* ===== Desktop View ===== */
@media (min-width: 992px) {
    .main-content-wrapper {
        padding-left: 10px;
    }

    #topic-sidebar {
        position: fixed;
        top: 62px; /* header ke neeche start hoga */
        left: calc(50% - 400px - 2px); /* container ke left se 2px distance */
        width: 250px;
        height: calc(100vh - 62px);
        transform: translateX(0);
        border-right: 1px solid var(--border-color);
        border-radius: var(--border-radius);
        overflow-y: auto;
        transition: left .3s ease-in-out;
        padding: 1rem;
        z-index: 1;
    }
@media (min-width: 992px) and (max-width: 1680px) {
    #topic-sidebar {
        position: fixed;
        top: 62px; /* header ke neeche */
        left: 0;
        width: 15%;
        height: calc(100vh - 62px);
        transform: translateX(0);
        background-color: var(--card-bg);
        border-right: 1px solid var(--border-color);
        border-radius: var(--border-radius);
        overflow-y: auto;
        transition: left .3s ease-in-out;
        padding: 1rem;
        z-index: 100;
    }

    #sidebar-overlay,
    #topic-sidebar-toggle {
        display: none;
    }
}

    /* Header 1050px ke hisaab se shift adjust */
    @media (min-width: 1680px) {
        #topic-sidebar {
            left: calc(50% - 810px - 2px);
        }
    }

    #sidebar-overlay,
    #topic-sidebar-toggle {
        display: none;
    }
}

/* ===== Mobile View ===== */
@media (max-width: 991px) {
    #topic-sidebar.is-open {
        transform: translateX(0);
        box-shadow: 0 0 25px rgba(0, 0, 0, .2);
    }
}